Relativity and Cosmology

   

Survival of small PBHs in the Very Early Universe

Authors: Paulo Sérgio Custódio

The formation of Primordial Black Holes is a robust prediction of several gravitational theories. Whereas the creation of PBHs was very active in the remote past, such process seem to be very negligible at the present epoch. In this work, we estimate the effects from the radiation surrounding PBHs due to the absorption term in the equations that describe how their masses depend on time. The Hawking radiation contributes with mass loss and the absorption term contributes with gain, but a interesting competition between these terms is analysed. These effects are included in the equations describing PBHs and its mass density as the universe evolves in time and the model is able to describes the evolution of the numerical density of PBHs and the mass evolution and comparisons with cosmological constraints set upper limits in their abundances. We evaluate the effect of this accretion onto PBHs and we get some corrections for the initial masses that indicates some deviations from de- fault values for the time scale for evaporation. The scale time of the PBHs in the early universe is modified due to the energy accretion and we can estimate how these contributions may alter the standard model of PBHs.

Comments: 18 Pages.

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Submission history

[v1] 2017-09-28 19:52:23

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